已知:在正方形ABCD中,AB=3,E是边BC上一个动点(点E不与点B,点C重合),连接AE,点H是BC延长线上一点.过点B作BF⊥AE,交AE于点G,交DC于点F.
(1)求证:AE=BF;
(2)过点E作EM⊥AE,交∠DCH的平分线于点M,连接FM,判断四边形BFME的形状,并说明理由;
(3)在(2)的条件下,∠EMC的正弦值为
,求四边形AGFD的面积.
(1)求证:AE=BF;
(2)过点E作EM⊥AE,交∠DCH的平分线于点M,连接FM,判断四边形BFME的形状,并说明理由;
(3)在(2)的条件下,∠EMC的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd92f594c348f7a956607f7b381cc22a.png)
更新时间:2019-07-11 16:51:30
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相似题推荐
解答题-问答题
|
困难
(0.15)
名校
【推荐1】【问题提出】在
中,
,直线
经过
两点,点
是直线
上一点,点
是边
上一点,连接
,将线段
绕点
顺时针旋转至
,使得
.
(1)如图①,当点
与点
重合时,易得:
与
的数量关系是______.
(2)如图②,当点
在线段
上,
时,请直接写出
之间的数量关系.
【结论运用】
(3)如图③,当点
在射线
上,
时,
,
,求
的长.
(4)如图④,当点
在射线
上,
时,
,请直接写出
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f110b51c99b4b70df29e0b642635d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/fba0909a-3e60-498b-afa4-be520171aadd.png?resizew=550)
(1)如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3dd88a4ae24a55d179cf5dd81fcb598.png)
【结论运用】
(3)如图③,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3121f9db21ee6bab92ee0d03c304fb6.png)
(4)如图④,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4801af010262a2185a98f84edc184d31.png)
您最近一年使用:0次
【推荐2】问题:如图1,在
中,
,点
是射线
上任意一点,
是等边三角形,且点
在
的内部,连接
.探究线段
与
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/80ed1c30-38b5-4b6d-9125-c4245c153d31.png?resizew=176)
请你完成下列探究过程:
先将图形特殊化,得出猜想,再对一般情况进行分析并加以证明.
当点
与点
重合时(如图2),请你补全图形.由
的度数为_______________,点
落在_______________,容易得出
与
之间的数量关系为_______________
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/bb6c5dde-6ea8-4294-a7d4-7996513040cb.png?resizew=185)
当
是
的平分线时,判断
与
之间的数量关系并证明
当点
在如图3的位置时,请你画出图形,研究
三点是否在以
为圆心的同一个圆上,写出你的猜想并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c16e957064354e113785370f55c84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/80ed1c30-38b5-4b6d-9125-c4245c153d31.png?resizew=176)
请你完成下列探究过程:
先将图形特殊化,得出猜想,再对一般情况进行分析并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/bb6c5dde-6ea8-4294-a7d4-7996513040cb.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0c12379ff58d8ddf66547d7a873baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a416e351c08669214734418cf60209e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65183d238c9bc2be73770717d890683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/a7a7ffb9-d724-4c0d-9554-c439d53a4529.png?resizew=194)
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解答题-问答题
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困难
(0.15)
名校
【推荐3】【概念呈现】:
当一个凸四边形的一条对角线把原四边形分成两个三角形.若其中有一个三角形是等腰直角三角形,则把这条对角线叫做这个四边形的“等腰直角线”,把这个四边形叫做“等腰直角四边形”;当一个凸四边形的一条对角线把原四边形分成两个三角形,若其中一个三角形是等腰直角三角形,另一个三角形是等腰三角形,则把这条对角线叫做这个四边形的“真等腰直角线”,把这个四边形叫做“真等腰直角四边形”.
(1)【概念理解】:如图①,若
,
,
,则四边形
(填“是”或“否”)真等腰直角四边形;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/775723fc-7ed9-47e6-95f3-ecae35acc084.png?resizew=177)
(2)【性质应用】:如图①,如果四边形
是真等腰直角四边形,且
,对角线
是这个四边形的真等腰直角线,当
,
时,
;
(3)【深度理解】:如图②,四边形
与四边形
都是等腰直角四边形,且
,
,
,对角线
分别是这两个四边形的等腰直角线,试说明
与
的数量关系;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/396825b5-cb30-4606-9d45-e240c81edd44.png?resizew=156)
(4)【拓展提高】:如图③,已知:四边形
是等腰直角四边形,对角线
是这个四边形的等腰直角线.若
正好是分得的等腰直角三角形的一条直角边,且
,
,
,求
的长.
当一个凸四边形的一条对角线把原四边形分成两个三角形.若其中有一个三角形是等腰直角三角形,则把这条对角线叫做这个四边形的“等腰直角线”,把这个四边形叫做“等腰直角四边形”;当一个凸四边形的一条对角线把原四边形分成两个三角形,若其中一个三角形是等腰直角三角形,另一个三角形是等腰三角形,则把这条对角线叫做这个四边形的“真等腰直角线”,把这个四边形叫做“真等腰直角四边形”.
(1)【概念理解】:如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a2f4950d53dd29233016737c45cb6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/775723fc-7ed9-47e6-95f3-ecae35acc084.png?resizew=177)
(2)【性质应用】:如图①,如果四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f92336571fa2d98813029b8c3c8a6f0.png)
(3)【深度理解】:如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad75d686fb0d5942b7fd2a591d48370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cac1926c2875b14ad658b56ac6f113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/396825b5-cb30-4606-9d45-e240c81edd44.png?resizew=156)
(4)【拓展提高】:如图③,已知:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a9983392-74c8-430e-9de8-7bc6484c9e67.png?resizew=180)
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解答题-作图题
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困难
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真题
【推荐1】如图甲,在△ABC中,∠ACB为锐角.点D为射线BC上一动点,连接AD,以AD为一边且在AD的右侧作正方形ADEF.解答下列问题:
![](https://img.xkw.com/dksih/QBM/2012/9/21/1573521921933312/1573521966161920/STEM/e0ec5241-fc63-4475-afc0-7d73541ab7d8.png?resizew=766)
(1)如果AB=AC,∠BAC=90º.
①当点D在线段BC上时(与点B不重合),如图乙,线段CF、BD之间的位置关系为 ,数量关系为 .
②当点D在线段BC的延长线上时,如图丙,①中的结论是否仍然成立,为什么?
(2)如果AB≠AC,∠BAC≠90º,点D在线段BC上运动.
试探究:当△ABC满足一个什么条件时,CF⊥BC(点C、F重合除外)?画出相应图形,并说明理由.(画图不写作法)
(3)若AC=
,BC=3,在(2)的条件下,设正方形ADEF的边DE与线段CF相交于点P,求线段CP长的最大值.
![](https://img.xkw.com/dksih/QBM/2012/9/21/1573521921933312/1573521966161920/STEM/e0ec5241-fc63-4475-afc0-7d73541ab7d8.png?resizew=766)
(1)如果AB=AC,∠BAC=90º.
①当点D在线段BC上时(与点B不重合),如图乙,线段CF、BD之间的位置关系为 ,数量关系为 .
②当点D在线段BC的延长线上时,如图丙,①中的结论是否仍然成立,为什么?
(2)如果AB≠AC,∠BAC≠90º,点D在线段BC上运动.
试探究:当△ABC满足一个什么条件时,CF⊥BC(点C、F重合除外)?画出相应图形,并说明理由.(画图不写作法)
(3)若AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
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解答题-证明题
|
困难
(0.15)
名校
【推荐2】阅读下面材料:有公共顶点A的正方形
与正方形
按如图1所示放置,点E,F分别在边
和
上,连接
,M是
的中点,连接
交
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/b6d4fe0f-74f5-4cea-8f48-8d848f6efb0d.png?resizew=342)
(1)【观察猜想】线段
与
之间的数量关系是__________,位置关系是__________;
(2)【探究证明】将图1中的正方形
绕点A顺时针旋转
,点G恰好落在边
上,如图2,其他条件不变,线段
与
之间的关系是否仍然成立?并说明理由.
(3)【拓展应用】在图2的基础上,若
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7941d355eebcd363be2577d2107496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/b6d4fe0f-74f5-4cea-8f48-8d848f6efb0d.png?resizew=342)
(1)【观察猜想】线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)【探究证明】将图1中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)【拓展应用】在图2的基础上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0e9f8c8556cb2dd7aa822ac4f921eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐3】阅读下面材料:
子薇遇到这样一个问题:如图1,在正方形
中,点
、
分别为
、
边上的点,
,连接
,求证:
.子薇是这样思考的:要想解决这个问题,首先应想办法将这些分散的线段集中到同一条线段上.他先后尝试了平移、翻折、旋转的方法,发现通过旋转可以解决此问题.他的方法是将
绕点
顺时针旋转
得到
(如图2),此时
即是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/e6a3e2b8-7b86-4290-a8db-59cd644fcd32.png?resizew=493)
请回答:在图2中,
的度数是 .
参考子薇得到的结论和思考问题的方法,解决下列问题:
(1)如图3,在直角梯形ABCD中,
,
,
,E是CD上一点,若
,
,求BE的长度.
(2)如图4,已知线段
,线段
绕点
旋转,且
,连接
,以
为边作正方形
,连接
.求线段
的最大值.
子薇遇到这样一个问题:如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99627df7b1a88b9bf3dda20390d245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4eef107fa9d4cedabdf5906c627cce5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/e6a3e2b8-7b86-4290-a8db-59cd644fcd32.png?resizew=493)
请回答:在图2中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f9f70b2bf8747fb27c7ca1ae7cdea4.png)
参考子薇得到的结论和思考问题的方法,解决下列问题:
(1)如图3,在直角梯形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820a5967922f6b02405789a4e9608891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5a38c27c3111dfd51b49de5b2e27fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f12c8e863e2661cb4a4b4138b06101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
(2)如图4,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】如图,在平面直角坐标系中,直线y=3x+b经过点A(﹣1,0),与y轴正半轴交于B点,与反比例函数y=
(x>0)交于点C,且BC=2AB,BD∥x轴交反比例函数y=
(x>0)于点D,连接AD.
(1)求b、k的值;
(2)求△ABD的面积;
(3)若E为射线BC上一点,设E的横坐标为m,过点E作EF∥BD,交反比例函数y=
(x>0)的图象于点F,且EF=
BD,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/912b9f1e-0070-4954-8191-6488faa41383.png?resizew=170)
(1)求b、k的值;
(2)求△ABD的面积;
(3)若E为射线BC上一点,设E的横坐标为m,过点E作EF∥BD,交反比例函数y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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【推荐2】已知:
内接于
,
为劣弧
的中点,
.
(1)如图1,当
为
的直径时,求证:
;
(2)如图2,当
不是
的直径,且
时,求证:
;
(3)如图3在(2)的条件下,
,
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/1da606e6-1fcf-47e3-965f-abc7abf6ff92.png?resizew=471)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba22260c74f203cced3bfee792227cf.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a82d262a88a358d9900b005bad93316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3fdabf0c80f88628ccff115d16ee05.png)
(3)如图3在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3032820a0d2d50d9143e7923f5936ddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525cef76ab5396af0846205d665388bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐3】如图,抛物线
与x轴交于A、B两点,点A在点B的左边,与y轴交于点C,点A的坐标为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/b5847d1c-5318-4764-aaec-a9af2e77c60e.png?resizew=452)
(1)如图1,求抛物线的解析式;
(2)如图1,点D在直线BC上方的抛物线上运动(不含端点B、C),连接DC、DB,当四边形ABDC面积最大时,求出面积最大值和点D的坐标;
(3)如图2,将(1)中的抛物线向右平移,当它恰好经过原点时,设原抛物线与平移后的抛物线交于点E,连接BE.点M为原抛物线对称轴上一点,N为平面内一点,以B、E、M、N为顶点的四边形是矩形时,若直线OK平分这个矩形面积,请直接写出直线OK的解析式.
①________________
②________________
③_______________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4c6135b12a4676c1ae9820f8cb04d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/b5847d1c-5318-4764-aaec-a9af2e77c60e.png?resizew=452)
(1)如图1,求抛物线的解析式;
(2)如图1,点D在直线BC上方的抛物线上运动(不含端点B、C),连接DC、DB,当四边形ABDC面积最大时,求出面积最大值和点D的坐标;
(3)如图2,将(1)中的抛物线向右平移,当它恰好经过原点时,设原抛物线与平移后的抛物线交于点E,连接BE.点M为原抛物线对称轴上一点,N为平面内一点,以B、E、M、N为顶点的四边形是矩形时,若直线OK平分这个矩形面积,请直接写出直线OK的解析式.
①________________
②________________
③_______________
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【推荐1】综合与实践
问题情境:如图1,正方形纸片
和
有公共顶点
,其中
.将正方形
绕点
按顺时针方向旋转
.
观察发现:
(1)如图2,当
时,连接
,小组成员发现
与
存在一定的关系,其数量关系是______________,位置关系是__________________.
探索研究:
(2)当
三点共线时,请在图3中画出图形,并直接写出此时
的长度.
拓展延伸:
(3)猜想图3中
与
的数量关系并证明.
问题情境:如图1,正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016a780b64dc21f123dd2a8a6a4d2b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8f03ea13934e8fd597d2dae9b66bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/8c95fcd9-8668-4054-a31a-8820ffd1feb1.png?resizew=766)
观察发现:
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480888079e87df2b1c0734114a594d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c233f7e711dc825e61f605f79a86f6a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
探索研究:
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8e45b50c77bf6a2cde628ea3455ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
拓展延伸:
(3)猜想图3中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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【推荐2】如图,在平面直角坐标系中,直线y=kx﹣
与抛物线y=ax2+bx+
交于点A、C,与y轴交于点B,点A的坐标为(2,0),点C的横坐标为﹣8.
(1)请直接写出直线和抛物线的解析式;
(2)点D是直线AB上方的抛物线上一动点(不与点A、C重合),作DE⊥AC于点E.设点D的横坐标为m.求DE的长关于m的函数解析式,并写出DE长的最大值;
(3)平移△AOB,使平移后的三角形的三个顶点中有两个在抛物线上,请直接写出平移后的点A对应点A′的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(1)请直接写出直线和抛物线的解析式;
(2)点D是直线AB上方的抛物线上一动点(不与点A、C重合),作DE⊥AC于点E.设点D的横坐标为m.求DE的长关于m的函数解析式,并写出DE长的最大值;
(3)平移△AOB,使平移后的三角形的三个顶点中有两个在抛物线上,请直接写出平移后的点A对应点A′的坐标.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2204757006696448/2205085510778880/STEM/d08fcd55101841e78bcaf63e481e42f3.png?resizew=224)
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解题方法
【推荐3】如图,在平面直角坐标系中,点O为坐标原点,直线yx m交 y轴的正半轴于点A,交x轴的正半轴于点B,过点A的直线AF交x轴的负半轴于点F,∠AFO=45°.
(1)求∠FAB的度数;
(2)点 P是线段OB上一点,过点P作 PQ⊥OB交直线 FA于点Q,连接 BQ,取 BQ的中点C,连接AP、AC、CP,过点C作 CR⊥AP于点R,设 BQ的长为d,CR的长为h,求d与 h的函数关系式(不要求写出自变量h的取值范围);
(3)在(2)的条件下,过点 C 作 CE⊥OB于点E,CE交 AB于点D,连接 AE,∠AEC=2∠DAP,EP=2,作线段 CD 关于直线AB的对称线段DS,求直线PS与直线 AF的交点K的坐标.
(1)求∠FAB的度数;
(2)点 P是线段OB上一点,过点P作 PQ⊥OB交直线 FA于点Q,连接 BQ,取 BQ的中点C,连接AP、AC、CP,过点C作 CR⊥AP于点R,设 BQ的长为d,CR的长为h,求d与 h的函数关系式(不要求写出自变量h的取值范围);
(3)在(2)的条件下,过点 C 作 CE⊥OB于点E,CE交 AB于点D,连接 AE,∠AEC=2∠DAP,EP=2,作线段 CD 关于直线AB的对称线段DS,求直线PS与直线 AF的交点K的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/d3ed6162-4add-4d54-ae61-0adee0fee639.png?resizew=766)
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